Jack.



J. DIXON.

JACK.

APPLICATION FILED 00w. 14, 1909.

95 9,320. Patented May 24, 1910.

2 SHEETS-SHEET 1.

&

' WitnmaQ W w- I J. DIXON.

JAGK.

APPLICATION FILED ooT. 1.4, 1909.

959,320. Patented May 24, 1910.

2 SHEETS-SHEET 2.

JOHN DIXON, OF WEST BADEN, INDIANA.

JACK.

Specification of Letters Patent.

Patented May 24, 1910.

Application filed. October 14, 1909. Serial No. 522,679.

To all whom it may concern:

Be it known that 1, JOHN DIXON, a citizen of the United States, residingat Vest Baden, in the county of Orange, State of Indiana, have inventedcertain new and useful Improvements in Jacks; and I do here by declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to improvements in jacks and has particularreference to a device of that kind usually employed for shifting a heavybody such as a locomotive or a car, laterally, after the said locomotiveor car has been raised vertically.

The principal object of the invention is the provision of a ack providedwith roller bearings upon which the shiftable platform bears, thusreducing the great amount of friction which would naturally exist werethe platform to slide on a track.

lVith the above and other objects in view as will more fully hereinafterappear, the present invention consists in certain novel details ofconstruction and arrangement of parts, hereinafter fully described,illus trated in the accompanying drawings and more particularly pointedout in the ap-' pended claims; it being understood that various changes"in the form, proportion, size and minor details of the device may bemade without departing from the spirit or sacrificing any of theadvantages of the invention.

In the accompanying drawings forming part of the specification :Figure'1 is a plan view of the device with the platform removed. Fig. 2 is asimilar view with the platform in position. Fig. 3 is a longitudinalsectional view approximately on the line 33 of Fig. 2. Fig. 4C is asimilar view on the line 44 of Fig. 2. Fig. 5 is a transverse sectionalview on the line 5-5 of Fi 2.

imilar numerals of reference are employed to designate correspondingparts throughout.

The frame upon which the platform is mounted for sliding movement isrectangular in contour and consists of the side plates 5 and 6, theopposite ends of which are connected by the end plates 7 and 8. Theseparts are all of metal and the frame may be cast as an integralstructure or the opposite ends of the side and end plates may be rivetedtogether. As shown in the drawings the widths of the side plates 5 and 6are considerably greater than the widths of the end plates 7 and 8, andat points in alinement with the lower edges of the end plates the sideplates are bent longitudinally and at right-angles, whereby supportingflanges 9 and 10 are provided being approximately the same in width asthe end plates 7 and 8.

An actuating bolt or screw 11 has one end journaled in the front endplate and extends through the said end plate, the portion of said screwlying adjacent the inner face of the end plate being provided with abushing 12 arranged to bear on the inner face of the end plate andserving to prevent endwise movement of the screw in one direction.Threaded into the opposite end plate and in direct alinement with theaxis of the actuating bolt or screw is a bearing screw 13, the terminalof which is blunt and has formed therein a conical socket 13 whichreceives the adjacent tapered end 14 of the actuating screw. 7

With this construction it is obvious that a cone bearing will beprovided for the screw, thus facilitating the turning operation of thelatter. That portion of the actuating bolt or screw extending throughone of the end plates is provided adjacent its free end with a ratchetwheel 14 and journaled on the said projecting portion of the actuatingbolt or screw is an operating handle 15. The handle 15 is provided witha pair of oppositely arranged spring pressed pawls 16 adapted to engagewith the ratchet wheel 14 and when so engaging to impart a turningmovement to the actuating bolt or screw when power is applied to theoperating handle.

The bearing surface for the sliding or shifting platform will now bedescribed. By referring to the drawings it will be seen that arranged onthe opposed inner faces of the side plates 5 and 6 are a plurality ofroller bearings. These members are arranged in staggered relation, thatis to say, that the roller hearings on one side plate will not be indirect alinement with those on the opposite side plate, whereby thetendency of the platform to kink while supporting a heavy load duringthe jacking operation, will be prevented. The rollers are designated bythe numeral 17 and are held in position by a pair of bed plates 18 and19. These members are formed of single pieces of metal and are rivetedor otherwise secured to the inner faces of the side plates 5 and 6 withtheir upper longitudinal sides lying considerably below the upperlongitudinal sides of the side plates 5 and 6. The bed plates 18 and 19are provided with a plurality of spaced sockets 20. The sockets 20 aresubstantially three quarters round and open through the upperlongitudinal sides of the bed plates. The rollers 17 are flat disks ofdiameters a trifle less than the diameters of the sockets so that whenpositioned in the latter a portion of the periphery of each roller willextend above the upper longitudinal side of the bed plate. The rollersare held against displacement by means of a pair of straps 21 and 22riveted or otherwise secured to the inner faces of the bed plates withtheir upper longitudinal sides rising to points adjacent the upperlongitudinal sides of the bed plates.

The shiftable or sliding platform is designated by the numeral 23 and ispreferably formed of a single piece of metal of greater width than theWidth of the frame and corresponding in length to the length of thelatter. The supporting platform is on its lower face, and adjacent itsopposite longitudinal edges provided with under-cuts 24. The lower facesof these under-cuts overhang the side plates 5 and 6, whereby the lowerface of the platform will bear on the rollers 17.

Depending from the medial portion and located adjacent that end of theplatform adjacent the operating handle 15 is a screw nut 25 whichreceives the threaded portion of the actuating bolt or screw 11. Thethreads of the actuating bolt or screw and screw nut are such that whenthe actuating bolt or screw is turned in one position the platform willmove bodily outward from the frame and when turned in the oppositedirection, the platform will move over and on to the frame.

A pair of bearing feet 26 and 27 are located adjacent the opposite endsof the frame and extend beyond the edges of the flanges 9 and 10. Thesebearing feet are preferably formed of single pieces of metal and byvirtue of their lengths increase the area of the bearing surface of thejack and prevent the latter from toppling.

From the foregoing it can be seen that I have provided a device which isexceedingly simple in construction and comparatively inexpensive tomanufacture, embodying few parts and these so arranged that the dangerof derangement will be reduced to a minimum.

Vhat is claimed as new, is

1. In a jack of the class described, a supporting frame, an actuatingscrew journaled in the opposite ends of said frame, rollers carried bythe sides of the frame, the rollers upon one side being out of alincmentwith the rollers upon the opposite side, and a platform connected withthe actuating screw and movable longitudinally of said frame with itslower face bearing on said rollers and upon the upper edges of the framesides.

2. In a jack of the class described, a supporting frame, an actuatingscrew having its opposite ends journaled in the opposite ends of saidframe, bed plates secured to the opposite inner faces of the sides ofsaid frame, said bed plates being provided with sockets opening throughthe upper sides of the bed plates, rollers loosely fitted in saidsockets with portions on their peripheries extending above the planes ofthe upper sides of the bed plates, a platform connected with theactuating screw and movable longitudinally of the frame, with its lowerface bearing on said rollers, said platform being provided withundercuts forming guides and bearing on the upper edges and inner facesof the frame sides.

In testimony whereof, I affix my signature, in presence of twowitnesses.

JOHN DIXON.

Witnesses:

EDGAR D. SPARKS, THoMAs H. LOVE.

